It's time to go over the pacing rules for your genre. You should already know this, meaning you shouldn't write in a genre until you've read the standards of it and have fallen in love with it, but even then  it might just be a set of rules rattling in the back of your mind.

What follows are general guidelines: they are not terribly specific. You'll see sections of the plot and how they are broken up across a story. This is the pattern you should see in your reading and your story should follow along. Let's dive in!

Young Adult
  • First 10% establishes protagonist and antagonists and secondary characters as well as everyday life
  • Next 30% focuses on a new goal or challenge and strengthens alliances and deepens conflict
  • Next 30% focuses on fear of losing goal, weakening of alliances, deepening of overall conflict
  • Next 20% focuses on diving how to achieve goal, repairing alliances, distancing from antagonists
  • Last 10% focuses on achieving goal, cementing alliances, cooling conflict with antagonists, establishing a new everyday life

Young Adult Paranormal
  • First 10% establishes protagonist and secondary characters as well as everyday life
  • Next 10% establishes antagonists and a change in everyday life
  • Next 30% focuses on a new goal or challenge and strengthens alliances and deepens conflict
  • Next 20% focuses on fear of losing goal, weakening of alliances, deepening of overall conflict
  • Next 20% focuses on diving how to achieve goal, repairing alliances, distancing from antagonists
  • Last 10% focuses on achieving goal, cementing alliances, cooling conflict with antagonists, returning to a slightly enhanced version of the everyday life established in the second 10%

Historical Romance:
  • First 5% Establishes main protagonist and everyday life
  • Second 5% either introduces love interest or secondary characters
  • Third 5% introduces love interest or secondary characters (whatever didn't come out in second 5%)
  • Next 10% introduces main external conflict caused by antagonist and introduces love interests
  • Next 15% introduces internal conflict between love interests
  • Next 20% shows slow weakening of conflict between love interests and verrrrrrry slow boil of antagonist plot
  • Next 10% shows start of full physical relationship between love interests and first serious action of antagonist
  • Next 20% shows love interests falling in love fighting antagonist
  • Next 5% is defeating the antagonist
  • Next 5% is overcoming all internal conflict between love interests and setting up a happily-ever after

Paranormal Romance
  • First 10% Establishes main protagonist,m secondary characters, and everyday life
  • Next 5% Introduces love interest, more secondary characters, his everyday life
  • Third 5% introduces antagonist and his/her/its plot
  • Next 20% introduces internal conflict between love interests as they meet and grapple with start of antagonist's plan
  • Next 20% shows start of full physical relationship between love interests and serious actions of antagonist
  • Next 20% shows love interests falling in love fighting antagonist as antagonist's plot becomes more complex
  • Next 5% is simplifying antagonist plot and resurgence of internal conflict between lovers
  • Next 10% is defeating the antagonist
  • Next 5% is overcoming all internal conflict between love interests and setting up a happily-ever after

Modern Romance:
  • First 10% Establishes main protagonist, secondary characters, and everyday life, as well as anxiety which will often be the antagonist
  • Second 10% Introduces love interest and sets up internal conflict between love interests
  • Next 30% shows slow weakening of conflict between love interests as physical relation starts in fits and jerks. Secondary characters help grow the "antagonist"
  • Next 20% shows start of full physical relationship between love interests and first serious action of antagonist
  • Next 10% shows love interests falling in love
  • Next 15% is love interests separated as protagonist defeats antagonist (if antagonist is a person love interests are separated, love interest defeats antagonist when reunited at end of this section)
  • Next 5% is overcoming all internal conflict between love interests and setting up a happily-ever after 

Genre Mystery
  • First 5% is introduction of lead in mystery and establishing protagonist
  • Second 5% is establishing secondary characters and everyday life
  • Next 10% is discovering real mystery (aka antagonist)
  • Next 20% is investigating real mystery (setting up red herrings)
  • Next 5% is discovering connection to original mystery and reversal of assumptions or luck, often secondary character death occurs
  • Next 25% is eliminating red herrings and growing external conflict
  • Next 20% is narrowing leads, growing internal and external conflict (more internal)
  • Next 5% is tracking antagonist
  • Last 5% is defeating antagonist and revealing solution to mysteries
General Fiction Mystery
  • First 10% is establishing protagonist and introduction of mystery
  • Second 5% is establishing secondary characters related to mystery
  • Next 25% is investigating real mystery (setting up red herrings)
  • Next 5% is reversal of luck, often secondary character death occurs
  • Next 25% is eliminating red herrings and growing external conflict
  • Next 20% is narrowing leads, growing internal and external conflict (more internal)
  • Next 5% is tracking antagonist
  • Last 5% is defeating antagonist and revealing solution to mysteries

Thriller
  • First 5% is establishing protagonists
  • Second 5% is introduction of antagonist, received as major secondary, presenting a new every day life
  • Third 5% is establishment of new everyday life
  • Next 15% is slow buildup of external conflict arising in secondary conflict
  • Next 20% is growing internal conflict between protagonists due to previous external conflict as external conflict is pieced together into a pattern
  • Next 20% is protagonist forming a hypothesis from pattern and appearance of an alley
  • Next 10% is major secondary revealed as antagonist and external conflict grows
  • Next 5% is death or loss of ally an external conflict separating protagonists from new everyday life
  • Next 10% is defeating antagonist
  • Last 5% is return to newest everyday life
Horror
  • First 5% is introduction of protagonists and everyday life
  • Second 5% is temptation of new everyday life that is an antagonists plot
  • Next 10% is establishment of new everyday life, secondary protagonist noticing external conflict, also appearance of magical ally
  • Next 20% is heavy internal conflict growing between protagonists as external conflict grows, appearance of magical enemy
  • Next 20% is protagonist slowly lessening internal conflict with secondary protagonist
  • Next 20% is protagonist tempted into dark side growing new external conflict with secondary protagonist
  • Next 10% is battle for protagonists soul 
  • Next 5% is full reveal of all magical beings and antagonist, a choice made by main protagonist
  • Last 5%  is new everyday life for whomever survives the battle

Epic Sci-Fi / Space Operas
  • First 5% is establishment of major external life-changing conflict for protagonist
  • Second 5% is establishing protagonist
  • Next 20% is establishing secondary characters, antagonist, call to action
  • Next 20% is protagonist adjusting to new every day life and assimilating call to action while growing in accordance to help from allies
  • Next 20% is protagonist separating from allies chasing down antagonist
  • Next 20% is protagonist closing in on antagonist reclaiming allies
  • Next 5% is protagonist and allies defeating antagonist
  • Last 5% is establishing a new everyday life for protagonist

All Other Sci-Fi:
  • First 10% is establishing protagonist and secondary characters as well as everyday life
  • Next 5% is establishment of major external life-changing conflict for protagonist
  • Next 15% is protagonist trying to avoid call to action, gaining mentor
  • Next 10% is protagonist assimilating call to action while growing in accordance to help from allies
  • Next 20% is protagonist separating from allies chasing down antagonist
  • Next 20% is protagonist closing in on antagonist reclaiming allies
  • Next 10% is protagonist and allies defeating antagonist
  • Last 10% is establishing a new everyday life for protagonist

Fantasy:
  • First 10% is establishing protagonist and secondary characters as well as everyday life
  • Next 10% is establishment of major external life-changing conflict for protagonist
  • Next 10% is protagonist trying to avoid call to action, gaining mentor
  • Next 10% is protagonist assimilating call to action while growing in accordance to help from allies
  • Next 30% is protagonist separating from allies chasing down antagonist
  • Next 10% is protagonist closing in on antagonist reclaiming allies
  • Next 5% is protagonist and allies defeating antagonist
  • Last 15% is establishing a new everyday life for protagonist

Urban Fantasy:
  • First 5% is establishing protagonist and secondary characters as well as everyday life
  • Next 10% is establishment of major external life-changing conflict for protagonist
  • Next 5% is protagonist trying to avoid call to action, gaining mentor
  • Next 10% is protagonist assimilating call to action while growing in accordance to help from allies
  • Next 30% is protagonist separating from allies chasing down antagonist
  • Next 30% is protagonist closing in on antagonist reclaiming allies
  • Next 5% is protagonist and allies defeating antagonist
  • Last 5% is establishing a new everyday life for protagonist
There you have the most popular current genres and how they are typically paced. These are not hard and fast rules, but when you read enough you will see they often confirm to these patterns. Good luck!